6CHK:
reference: Automatic Recognition of Ligands in Electron Density by Machine Learning., Kowiel M, Brzezinski D, Porebski PJ, Shabalin IG, Jaskolski M, Minor W, Bioinformatics. 2018 Jul 17. pii: 5055122. doi: 10.1093/bioinformatics/bty626. PMID: 30016407

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